Reamer grinder



May 14, 1935.

E. R. ZElTZ ET AL REAMER GRINDER Filed Nov. 5, 1931 5 Sheets-Sheet l 4o :2 as al 42 37 99 97 9e May M, W350 E. R. ZElTZ ET AL REAMER GRINDER 5 Sheets-Sheet 3 Filed Nov. 3, 1931 Patented May 14, 1935 UNITED STATES PATENT. OFFICE 2,001,173 REAMER GRINDER Edwin E. Zeitz, New Haven, and Stanley W. Dennison, Branford, Conn.

Application November 3, 1931, Serial No. 572.770

I 7 Claims. (01. 51--123-) M This invention relates to reamer grinders and more particularly to a relatively simple and inexpensive machine to grind or sharpen reamers, the machine being compact and being provided with the necessary adjustments and movements for the grinding wheel and for the holding devices for the work or reamers, so that reamers of dififerent sizes, both as to length and diam eter, and also of different dimensions as to taper, may be easily and readily inserted and ground without the necessity of wasting a considerable amount of time in adjusting the various parts of the machine. Moreover the machine is so constructed that once av reamer is mounted therein, it may be ground quickly and eificiently.

' One object of the invention is the provision of a reamer grinder which may be constructed as a simple and compact device, and, while inexpensive, willgrind reamers of various sizes and dimensions efiiciently and quickly.

A further object of the invention is the provision of a simple and compact device for grinding or sharpening reamers such that it may be quickly and readily adjustedto grind reamers of various sizes and dimensions.

A further object of the invention is the provision of a reamer grinder wherein the grinding wheel and driving motor therefor are movably mounted in the frame of the machine for adjustment to or from the work.

' Afurther object of the invention is the provision of a carrier or holder for the work or reamers which has amultiplicity-of adjustments so that reamers of various dimensions may be ground therein.

Another object of the invention is the pro vision in a reamer grinder of improved work holdersand mounting means therefor.

To these and other ends, the invention consists in the novel features and combinations of parts tobe hereinafter described and claimed.

In the accompanying drawings:

Fig. 1 is a top plan view of a reamer grinder embodying our invention;

. Fig.2 is a front elevational view of the same;

Fig.3 is a sectional view on line 3--3 of Fig. 1; Fig. 4 is a sectional view on line 4-4 of Fig.3; Fig. Sis a sectional view on line 5--5 of Fig. 1;

Fig. 6 is a sectional View on line 6-45 of Fig. 5;

. Fig. 7 is a sectional view on line '|-l of Fig. 1;

Fig. 8 is an enlarged detail View of the grinding wheel and associated structure;

Fig. 9 is an enlarged detail view of one of the reamer holders, and I Fig. 10 is a sectional view on line Ifl--l 0 of Fig. 2.

Fig. 1.1 is a sectional view on line ll- H of To illustrate a preferred embodiment of our invention, we have shown a base frame or stand.- ard which comprises a grinding wheel supporting portion l9, and a work-holder supporting portion H. connected to. the portion, 10 by the Web I 2. Journaled in the. upper portion of the frame In is a shaft [3 held against longitudinal move ment by the screw I4. the end of which enters an annular groove l5 in the shaft. This shaft may be. turned by the hand wheel 16 and is provided with screw threads I! for a portion of its length I p p A grinding wheel and motor support I8 is suspended from the shaft l 3 by means of the journal member l9 slidably mounted on theshafhand the ear 2!] which. surrounds the shaft. and is pro vided with an internal screw-threaded opening 21 to cooperate with the screw threads ll. The support I8 is provided with bearings 22 and 23 to supp rt the grinding wheel shaft 24, and is also provided with a forwardly extending guide sleeve 25 through which the shaft 24 extends.

A motor 26 is suspended from the support l8 by means of lugs 21 and 28 secured to the motor and connected to ears 29 and 3!] provided on the support It. Upon the motor shaft is provided a pulley 3|, and a belt 32 may be trained about this pulley and a pulley 33 on the grinding wheel shaft 24.

As shown in Fig. 11, the support I8 is provided with lateral guiding surfaces I09, and guide screws I06 are threaded through the wall of the support Ill and are provided with guide heads I511 which bear against the surfaces H19. Lock nuts I08 are mounted on these screws to hold them in adjusted position. The screws I06 may be set up against the surfaces I09 to prevent the support 18 from swinging about the shaft l3, but leaving it free for adjustment along this shaft.

The shaft 24 projects forwardly from the support l8 and non-rotatably mounted upon the projecting end of this shaft is the grinding wheel 34.

.A guard 35 extends about the upper portion of the grinding wheel, and is supported by means of a sleeve tfi, which projects rearwardly from the guard and embraces and is secured to the sleeve and adjacent this cut away portion, the guard is provided with an eye 38, in which is secured a rod 39 by means of a set screw 40. The rod 39 projects beyond the face of the grinding wheel, and in its projecting end is adjustably mounted a vertically extending rod 4-! by means of a set screw 52, the member i! passing through an opening in the rod 33. A resilient guide or stop member 43 is secured to the member 4 I, which acts as a guide finger to cooperate with the flutes or grooves in the reamer, as shown in Fig. 8, and to hold the reamer in the proper position for grinding, and also to serve as an index finger to enable the operator to present one blade after another of the reamer to the wheel.

With reference to Fig. 1, it will be apparent that the portion H of the base or frame extends generally transversely to the longitudinal dimension of the portion IE, and the axis of the grinding wheel. This portion H is, however, disposed at an oblique angle to the axis of the grinding wheel in order to present the work properly to the cup-shaped grinding wheel.

Within the portion H and extending substantially the full length thereof is secured a rod 45, and mounted above this portion of the device is a work carriage 46 which is provided with a Web portion 4'! extending within the portion H and there provided with a bearing 48, which embraces and is slidably engaged with the rod 45. The carriage $6 is thereby slidably mounted upon this rod, and it is provided at its forward end with a bracket 50 upon which is supported a roller 5! which rides upon a track or guide 52 on the casting H. It will be apparent, therefore, that the carriage 45 may slide in a reciprocating movement in a path generally transversely of the grinder shaft 24. V

A sub-base or support 53 is pivoted to the carriage 45 by the threaded pivot pin 54 so that this base may swing relatively to the carriage on a vertical axis. At one end the sub-base 53 is provided with an arcuate surface in which are cut rack teeth 55 designed to be engaged by the worm 56 mounted upon the shaft 5'! which is journaled in the carriage 45 and operated by the knurled wheel 58. It will be obvious that when the shaft 51 is turned, the sub-base 53 will be moved angularly about the pivot pin 54 in a horizontal plane, so that reamers of different dimensions as to taper may be properly fed to the grinding wheel. It will also be obvious that this adjustment may be made easily and quickly without the use of any tools.

The sub-base 53 is provided with upstanding ears 60 and 6! which are bored to rotatably re ceive the rod 62. Secured to this rod by the pins 63 and 54 is the support for the work holders or work centers. This support 65 com prises a member which extends longitudinally of the rod 62 and is provided with perforated ears 65, 61 and 58 which embrace the shaft, the pins 63 and 64 extending through the ears 56 and 68.

A pinion in is secured to the rod 62 within the ear 6! and the teeth of this pinion are engaged by a worm H secured upon a shaft 12 rotatably mounted in upstanding lugs 13 and 14 on the sub-base 53. The shaft 12 may be operated by the knurled wheel M and it will be observed that, as this shaft is turned, the pinion and the rod 62 with which it is engaged, will be rotated. This will serve to swing the support 65 and the work holders carried thereby upwardly or downwardly, as shown in Fig. 3, and as will be explained more fully hereinafter to adjust the relief cut imparted to the blades or teeth of the reamer or other work which is being operated upon.

Adjacent one end the support is provided with a T-shaped slot 15 within which is slidably received the correspondingly shaped portion 16 of the work-holding arm Ti. This arm may be slidably adjusted within the slot 15 and held in adjusted position by means of the set screw 18. The arm ll isprovided with a collar portion '18, within which is mounted a sleeve 1'9. Slidably mounted within the sleeve 19 is a shaft 8 having a threaded end 8| The sleeve 19 is provided with an enlarged end 82 between which and the main portion of the sleeve is a shoulder 83, and mounted on this sleeve is a collar 84 having a shoulder opening to engage the shoulder 83 and to which is secured a complementary collar 85 by means of the screws 86, the collar 85 having a threaded opening the threads of which are engaged with the threads 8| of the shaft 80. It will be apparent that the collars 84 and 85 will be held against longitudinal movement by being clamped upon opposite sides of the enlarged portion 82 of the sleeve 19, and that by rotation of these collars, the threaded shaft 80 will be moved longitudinally within the sleeve.

The shaft 8! is provided at its other end with a groove 8'! which is designed to lie opposite a similar groove 88 in a collar 89, and a ring 90 mounted in this groove serves to rotatably secure the collar upon the shaft. Threadedly engaged with the collar 89 is the work-holding center 9|, the threaded opening in which is slightly eccentric to its axis sothat it will lie slightly off center with respect to the shaft 80. provided with a cut out portion 92 in the edge thereof, and a pin 93 is disposed in this groove and secured in the shaft 86 to limit the rotation of the collar and work center upon the shaft. When the pin 93 is against one shoulder of the cut out portion, the axis of the two centers will be substantially coincident, while, when the pin is against the other shoulder of the cut out portion, the work-holding center 9! will be slightly offset with respect to the center 99.

At the other end of the support 65 is secured a second work-holding arm 95 which is substantially like and complementary to the arm 11. As it is necessary to have only one of these arms adjustable to accommodate reamers of various lengths, the arms 95 may be, and preferably will be, secured to the support.

The arm 95 is provided with a collar 96 within which is secured a sleeve 81. A shaft 98 is slidably mounted in this sleeve and on the projecting end of the shaft is the work-holding center 99 which cooperates with the complementary work center 9! to hold the work while it is being operated upon. The shaft 98 is provided with a reduced portion I00 about which is a spring till which acts between a shoulder I92 on the shaft 98 and a shoulder I93 on a nut I04 threadedly secured to the sleeve 91. A nut H35 secured on the shaft 88 limits the movement of this shaft to the left, as shown in Fig. 7, under the influence of the spring. It will, of course, be obvious that the center 99 may be pushed to the right,

as shown in Figs. 1 and '7, to permit the insertion of the work between the centers, and when the center 99 is released, the work will be held between the two centers by the action of the spring Illl.

It will be observed that only one of the workholding arms 11, as shown, is adjustable and also only one of the center holding shafts, the shaft The collar 89 is 80, is adjustable. The adjustment of the shaft 80 will be employed principally tokeep the centers at the right distance apart properly to tension the spring It! to hold the work in place.

While the operation of our device will probably be apparent from the foregoing description, it may be briefiy summarized as follows. When it is desired to grind or sharpen a reamer or similar article, the arm 11 will be moved to the right or left and clamped in adjusted position by the screw 18 depending upon the length of the work. If necessary, the center shaft 80 may be moved to the right or left by means of the rotation of the collars 84 and 85. The reamer or other work may then be placed between, the centers 9! and 99. If necessary, the knurled wheel 58 may be operated to the right or left to swing the sub-base 53 about its vertical pivot 54 to adjust the centers for the taper of the particular reamer being ground. Also the knurled wheel 14 may be turned to adjust the central axis of the reamer with respect to the axis of the grinding wheel so that the proper relief cut may be madeon the teeth or blades of the work. 7

The hand wheel l6 will also be turned to set the grinding wheel up to the work. This adjustment will, of course, be necessary when reamers of different diameters are to be ground.

The stop 33 will then be engaged in one of the flutes of the reamer, as shown in Fig. 8, and the operator will manually push the carriage 46 along the rod 45 and across the face of the grinding wheel. It will be apparent that the stop finger or index finger 43 will follow the flute or groove of the reamer and cause the grinding wheel to follow the tooth or blade. of the work.

It will be apparent to those skilled in the art that the tooth or blade of the reamer will be at a slight angle to the face of the grinding wheel, for as the latter is a cup-shaped or cylindrical wheel, the cutting is performed at one edge only thereof. This is facilitated by the fact that the axis of the wheel is set at a slight angle, preferably an angle of about 82, to the path of movement of-the carriage 46.

When the reamer has been carried across the face of the wheel and one tooth or blade thereof ground, the entire carriage is tipped about the rod 45 raising the roller from the track 62 and raising the work out of contact with the wheel. The carriage may then be returned to its starting position, no work being done, of course, during the return movement. The reamer is then rotated by the operator until the index finger 43 rests in the next adjacent groove of the reamer, and the device is in readiness to grind or sharpen the second tooth or blade.

It will be apparent that a reamer may be positioned in the device and the proper adjustments made very quickly and efficiently, and it will only require a short time to grind or sharpen a reamer upon our device.

While we have shown and described a preferred embodiment of our invention, it, will be understood that it is not to be" limited to all of the details shown, but is capable of modification and variation within the spirit of the invention and Within the scope of the appended claims.

What we claim is: i

1. In a reamer grinder, a frame, a grinding wheel operatively supported by said frame, a carriage mounted to move generally transversely of the grinding wheel and to tilt about a horizontal axis, a sub-base mounted on said carriage to move relatively thereto in a horizontal plane, and work holders supported on said sub-base, and said work holders being mounted to center about a horizontal axis, and means for moving said work holders about said axis and holding them in adjusted position.

2. In a reamer grinder, a supporting frame, a grinding wheel rotatably carried by said frame,

a rod mounted in the frame, a carriage slidab'ly and rotatably mounted on said rod, means on said frame to limit the rotatable movement of said carriage in one direction, work holders supported upon the carriage, and means for supporting said work holders, said means being mounted on said carriage to move about a vertical axis.

3. In a reamer grinder, a supporting frame, a grinding wheel operatively supported thereon, a carriage slidably mounted on said frame, a sub-base pivoted on said carriage, work-holding arms, means for pivotally supporting said arms upon the sub-base, and means for adjusting said arms about the pivot comprising a pinion connected to the supporting means for the arms, and a worm carried by the sub-base and cooperating with the pinion.

4. In a reamer grinder, a supporting frame, a grinding wheel operatively supported thereon,

a carriage slidably mounted on said frame, a-

sub-base pivoted on said carriage, upstanding lugs on said sub-base, a shaft rotatably mounted in said lugs, work-supporting means pivoted on said shaft, and means for rotating said shaft and securing it in adjusted positions.

5. In a reamer grinder, a suitably supported grinding wheel, a work carriage, a frame supporting said carriage for sliding movements, said carriage having a substantially fiat upper portion, a work-supporting member mounted on said portion to swing about an axis substantially perpendicular thereto, means for moving said work-supporting member about its pivot and securing it in adjusted position, and work holders supported on the work-supporting member for swinging movements about a horizontal axis relatively thereto.

6. In a reamer grinder, a suitably supported grinding wheel, a work carriage, a frame supporting said carriage for sliding movements, said carriage having a substantially fiat upper portion, a work-supporting member mounted on said portion to swing about an axis substantially perpendicular thereto, and means for moving said work-supporting member about its pivot and securing it in adjusted position comprising gear teeth provided in the supporting member, a worm journaled in the carriage and engaging said gear teeth, means for rotating said worm, and work holders supported on the worksupporting member for swinging movements about a horizontal axis relatively thereto.

'7. In a reamer grinder, a supporting frame, a shaft rotatably mounted in the frame and having threads thereon, a hanger carried by said shaft and having threaded connection therewith, a grinding wheel shaft rotatably mounted in bearings in said hanger and having a grinding wheel mounted upon one end thereof, a motor suspended from the hanger and having its shaft operatively connected to the grinding wheel shaft, and means for rotating said first named shaft to move said hanger, motor and grinding wheel longitudinally of the grinding wheel shaft.

EDWIN R. ZEITZ. STANLEY W. DENNISON. 

